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A blocked defrost drain is one of the most common causes of water leaking from your refrigerator and is a good place to start troubleshooting. The small drain opening is easily blocked by food particles or ice, preventing water that accumulated during the defrost cycle from draining to the pan.
The water is coming from the defrost system. Your defrost system drains water through a tube into a pan at the bottom of the refrigerator, where it evaporates. This tube could be clogged, or the pan could be ajar and the tube spills the water on the floor instead of the pan.